HADOOP-17294. Fix typos existance to existence

[eltociear]

NOTICE

Please create an issue in ASF JIRA before opening a pull request,
and you need to set the title of the pull request which starts with
the corresponding JIRA issue number. (e.g. HADOOP-XXXXX. Fix a typo in YYY.)
For more details, please see https://cwiki.apache.org/confluence/display/HADOOP/How+To+Contribute

[tasanuma]

@eltociear Thanks for the PR.
Could you also fix it in HadoopArchiveLogs.md?

$ grep existance ./hadoop-tools/hadoop-archive-logs/src/site/markdown/HadoopArchiveLogs.md
to prevent conflicts. It does this by checking for the existance of a

[eltociear]

@tasanuma Thank you for your announcement. I'll fix it.

[eltociear]

@tasanuma I've fix HadoopArchiveLogs.md.
Please re-review my PR.

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	1m 9s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	markdownlint	0m 1s		markdownlint was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
-1 ❌	test4tests	0m 0s		The patch doesn't appear to include any new or modified tests. Please justify why no new tests are needed for this patch. Also please list what manual steps were performed to verify this patch.
			_ trunk Compile Tests _
+0 🆗	mvndep	5m 44s		Maven dependency ordering for branch
+1 💚	mvninstall	31m 6s		trunk passed
+1 💚	compile	30m 3s		trunk passed with JDK Ubuntu-11.0.8+10-post-Ubuntu-0ubuntu118.04.1
+1 💚	compile	24m 25s		trunk passed with JDK Private Build-1.8.0_265-8u265-b01-0ubuntu2~18.04-b01
+1 💚	checkstyle	4m 0s		trunk passed
+1 💚	mvnsite	1m 34s		trunk passed
+1 💚	shadedclient	23m 36s		branch has no errors when building and testing our client artifacts.
+1 💚	javadoc	1m 24s		trunk passed with JDK Ubuntu-11.0.8+10-post-Ubuntu-0ubuntu118.04.1
+1 💚	javadoc	1m 16s		trunk passed with JDK Private Build-1.8.0_265-8u265-b01-0ubuntu2~18.04-b01
+0 🆗	spotbugs	0m 56s		Used deprecated FindBugs config; considering switching to SpotBugs.
+1 💚	findbugs	2m 21s		trunk passed
			_ Patch Compile Tests _
+0 🆗	mvndep	0m 31s		Maven dependency ordering for patch
+1 💚	mvninstall	1m 7s		the patch passed
+1 💚	compile	28m 48s		the patch passed with JDK Ubuntu-11.0.8+10-post-Ubuntu-0ubuntu118.04.1
+1 💚	javac	28m 48s		the patch passed
+1 💚	compile	24m 50s		the patch passed with JDK Private Build-1.8.0_265-8u265-b01-0ubuntu2~18.04-b01
+1 💚	javac	24m 50s		the patch passed
+1 💚	checkstyle	3m 37s		the patch passed
+1 💚	mvnsite	1m 34s		the patch passed
+1 💚	whitespace	0m 0s		The patch has no whitespace issues.
+1 💚	shadedclient	17m 26s		patch has no errors when building and testing our client artifacts.
+1 💚	javadoc	1m 21s		the patch passed with JDK Ubuntu-11.0.8+10-post-Ubuntu-0ubuntu118.04.1
+1 💚	javadoc	1m 13s		the patch passed with JDK Private Build-1.8.0_265-8u265-b01-0ubuntu2~18.04-b01
+1 💚	findbugs	2m 45s		the patch passed
			_ Other Tests _
-1 ❌	unit	10m 33s	/patch-unit-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-app.txt	hadoop-mapreduce-client-app in the patch passed.
+1 💚	unit	1m 15s		hadoop-archive-logs in the patch passed.
+1 💚	asflicense	0m 59s		The patch does not generate ASF License warnings.
		222m 36s

Reason	Tests
Failed junit tests	hadoop.mapreduce.v2.app.rm.TestRMCommunicator

Subsystem	Report/Notes
Docker	ClientAPI=1.40 ServerAPI=1.40 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2357/2/artifact/out/Dockerfile
GITHUB PR	#2357
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient findbugs checkstyle markdownlint
uname	Linux 3bf2580c7bd4 4.15.0-112-generic #113-Ubuntu SMP Thu Jul 9 23:41:39 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 43b0c0b
Default Java	Private Build-1.8.0_265-8u265-b01-0ubuntu2~18.04-b01
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.8+10-post-Ubuntu-0ubuntu118.04.1 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_265-8u265-b01-0ubuntu2~18.04-b01
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2357/2/testReport/
Max. process+thread count	566 (vs. ulimit of 5500)
modules	C: hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app hadoop-tools/hadoop-archive-logs U: .
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2357/2/console
versions	git=2.17.1 maven=3.6.0 findbugs=4.0.6
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[tasanuma]

The failed test is not related. +1.

[tasanuma]

Merged to trunk. Thanks for your contribution, @eltociear!

[eltociear]

@tasanuma Thank you for your reviewing!